This doesn't feel ideal. Though it's true that all directories are influenced by
any init scripts they have, the directory middleware shouldn't need to know
about Lua.
I don't really want to go back into working on the middleware chain since it
mostly feels like busywork when there are other things to build on in Rojo.
also all of this feels really complicated
This was failing snapshot tests on the Linux CI machines,
since I committed snapshots with backslashes.
I think the old path serializer was still the wrong approach,
this one is sort of a middleground but I'm still not super
happy with it.
